We specialize in performing tensile tests for welding procedure qualifications and for testing of base materials. Our tensile tester is from the brand Instron, model DX 600. This means that the tensile tester can exert a maximum force of 600 kN and complies with the current ISO 6892 standard. Materials Testing Veendam is a testing expert for, among others, the:
We conduct destructive tensile tests on metals and metal alloys. In a tensile test, a test specimen of the material to be tested is placed in a tensile testing machine and held in place by means of two clamps. The specimen is then subjected to loading. At Materials Testing Veendam this is done by hydraulic actuation. Both the tensile force and the effect, the elongation, are measured and presented in a graph. The goal of the tests is to obtain data of interest to damage experts, engineers, or designers, such as material properties, the modulus of elasticity, the elastic or yield limit, and the tensile strength.
The tensile test can be performed along the length, across the width, and through the thickness of a material. Tensile tests through the thickness of sheet material are conducted to determine whether lamination has occurred in the sheet material.
By far the majority of tensile tests are displacement-controlled, in which the test specimen is exposed to a certain strain. An alternative is stress-controlled tensile tests. In these, the stresses in the jacks are adjusted. Both types of tensile tests require their own technique and own equipment. Materials Testing Veendam can perform both displacement-controlled and stress-controlled tensile tests.
The tensile force applied to the test specimen will cause its length to increase. This occurs initially linearly/elastically. This means that if the test stops, the test specimen returns to its original value. Only after reaching the elastic limit does the material deform plastically. For this, a continuous tensile load is required up to reached maximum. For this maximum, the deformation of the test bar is evenly distributed along the bar. We observe that with nearly constant volume the increasing length is balanced by a decreasing diameter. In strain-controlled tests, this is translated into a drop in the stress in the bar. The breaking of the test specimen marks the end of the test.
